Across
- 2. living factors in an enviorment
- 5. individual organisms of a single species that share the same geographical location
- 10. one organism benefits at the expense of another organism
- 11. Scientific discipline
- 13. anything
- 14. the exchange of matter through biosphere
- 16. total mass of living matter
- 17. the rule in its enviorment
- 19. large group of ecosystems
- 20. a chemical substance
Down
- 1. a relationship in which other organism is neither helped or harmed
- 3. non-living factors in an enviorment
- 4. organisms in the soil convert amonia
- 6. each step in food chain or web
- 7. organisms pursuing and consuming another organisms for food
- 8. a group of interacing populations
- 9. nitrogen into a form that is usable by plants
- 12. an area where organisms live
- 15. portion of the earth that supports life
- 18. when two or more species live together